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Related Experiment Video

Updated: Jun 1, 2026

Psychophysiological Assessment of the Effectiveness of Emotion Regulation Strategies in Childhood
08:09

Psychophysiological Assessment of the Effectiveness of Emotion Regulation Strategies in Childhood

Published on: February 11, 2017

Serotonergic contribution to boys' behavioral regulation.

Amélie Nantel-Vivier1, Robert O Pihl, Simon N Young

  • 1Psychology Department, McGill University, Montreal, Canada.

Plos One
|June 16, 2011
PubMed
Summary

This study found that acute tryptophan supplementation in boys with behavior regulation difficulties improved their ability to adjust responses to provocation and enhanced social behaviors like perspective-taking and helping. Further research is needed to explore serotonin

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Nutritional Psychiatry

Background:

  • Serotonin plays a role in behavior regulation in adults, but its function in children is less understood.
  • Boys with a history of behavior regulation difficulties may have altered serotonergic functioning.
  • Acute tryptophan supplementation (ATS) is a method to temporarily increase serotonin synthesis.

Purpose of the Study:

  • To investigate the effects of acute tryptophan supplementation on behavior regulation in boys.
  • To assess whether findings from adult studies on serotonin and behavior apply to prepubertal children.
  • To evaluate the feasibility of ATS in a pediatric population.

Main Methods:

  • A double-blind, placebo-controlled study involving 23 ten-year-old boys with a history of physical aggression.
  • Participants received either a tryptophan-supplemented milkshake or a placebo milkshake.
  • Behavioral assessments included a competitive reaction time game, Go/No-Go task for impulsivity, emotion recognition task, and an instrumental help task.

Main Results:

  • Tryptophan supplementation did not alter responses to high provocation but improved optimal adjustment of responding based on provocation levels.
  • Boys receiving tryptophan showed trends towards enhanced perspective-taking, better recognition of fear and happiness facial expressions, and increased instrumental helping.
  • Control group boys decreased their responding towards the end of the competition, unlike the tryptophan group.

Conclusions:

  • Acute tryptophan supplementation appears feasible in children and may influence behavior regulation.
  • Findings suggest a potential role for enhanced serotonergic functioning in modulating dominant and affiliative behaviors in boys.
  • Further research is warranted to confirm these effects and explore underlying mechanisms.